radon in basement 2

https://inkmeridianx.com/s/MMRz7fzfGQ6t_ISNSqM4-

I had a friend who was selling her house and the buyer's inspection found high radon in basement. It was a real surprise because the basement was finished and always seemed clean. She had to spend about a thousand bucks on a mitigation system, which is basically a fan and pipe that vents the gas outside. It felt like a hassle but I guess better than breathing radioactive particles for years.